The method of accessing the I/O devices by repeatedly checking the status…
2023
The method of accessing the I/O devices by repeatedly checking the status flags is
- A.
program-controlled I/O
- B.
memory-mapped I/O
- C.
I/O-mapped I/O
- D.
More than one of the above
- E.
None of the above
Attempted by 203 students.
Show answer & explanation
Correct answer: A
The method described is repeatedly checking the status flags of an I/O device, which is known as Polling.
In Program-controlled I/O (Polling I/O):
The CPU continuously checks the status register
It waits until the device becomes ready
No interrupts are used
Key Idea:
Repeated checking = Polling
Polling = Program-controlled I/O
Hence, the correct answer is Program-controlled I/O